If you have a heater control valve it may be only
opening part way or clogged. Some vehicles
use a heater control valve to shut off the
coolant flow through the heater core when a/c
is selected. Some valves are vacuum operated
while others are cable operated. It could also be
the temperature door under the dash is not
going to the full heat position. In '93 I believe it
would be cable operated. One end of the cable
hooks to the temperature lever on the dash and
the other end to the temperature door under the
dash. Since you replaced the heater core the
cable may need to be adjusted to give full heat.
HTH. -Jim

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